Your agents reason.
klanex executes.

import { Klanex, KlanexSchemaError } from "@klanex/sdk";

const klanex = new Klanex({ apiKey, baseUrl });

try {
  const { executionId } = await klanex.execute({
    target: { url: "https://api.stripe.com/v1/refunds", headers: { Authorization: key } },
    payload: agentGeneratedJson,
    payloadSchema: refundSchema,
    idempotencyKey: `refund-${chargeId}`,
  });
} catch (err) {
  if (err instanceof KlanexSchemaError) {
    // feed the hint back — the agent fixes its own payload
    messages.push({ role: "user", content: err.llmHint });
    return retryWithLLM(messages);
  }
}

from klanex import Klanex, KlanexSchemaError

klanex = Klanex(api_key=API_KEY, base_url=BASE_URL)

try:
    accepted = klanex.execute(
        target={"url": "https://api.stripe.com/v1/refunds",
                "headers": {"Authorization": key}},
        payload=agent_generated_json,
        payload_schema=refund_schema,
        idempotency_key=f"refund-{charge_id}",
    )
except KlanexSchemaError as err:
    # feed the hint back — the agent fixes its own payload
    messages.append({"role": "user", "content": err.llm_hint})
    return retry_with_llm(messages)

$ curl -s https://api.klanexai.com/v1/executions \
    -H "X-API-Key: klx_…" \
    -d '{
      "target": { "url": "https://api.stripe.com/v1/refunds",
                  "headers": { "Authorization": "Bearer …" } },
      "payload": { "charge_id": "ch_9f2k", "amount": 500 },
      "payload_schema": { "type": "object", "required": ["charge_id", "amount"] },
      "idempotency_key": "refund-ch_9f2k"
    }'

{"execution_id": "exe_4d0c85a6", "status": "QUEUED"}